exam Maths Puzzle Numerical Ability

solve for X : log(x-5)+ log 4 = 2

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exam Other Question

A rectangle is three times as long as it is wide. If its length and width are both decreased by 2cm, its area is decreased by 36 cm sqaure. Find its original dimensions. 9a^6 - 48a^4 + 64a^2 factor expression completely, if expression is prime, so indicate. (Include the check of your answer using multiplication)